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- A particle emitted spontaneously from the nuclei of some radioactive elements. It is identical to a helium nucleus, having a mass of four units and a charge of positive two.
DoD Missile Defense Agency - Cite This Source - This Definition
- CPB, Main Beam, MBE, NAAF, Neutral Particle Beam (NPB), NPB, Particle Beam (PB), Particle Beam Weapon (PBW), SBNPB, SBPB, SLBD